<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <el-alert title="注意:只允许为第三级分类设置相关参数!多个参数用逗号分割" type="warning" show-icon :closable="false">
            </el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类:</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader v-model="selectedCateKeys" :options="CateList" expand-trigger="hover"
                        :props="cateProps" @change="handleChange">
                    </el-cascader>
                </el-col>
            </el-row>
            <!-- tabs页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 动态参数面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数
                    </el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag v-for="(item,index) in scope.row.attr_vals" :key="index" closable
                                    @close="handleClose(index,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 动态添加tag -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">
                                    + New Tag
                                </el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-adit" size="mini"
                                    @click="showEditDialog(scope.row.attr_id)">编辑
                                </el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini"
                                    @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 静态属性面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性
                    </el-button>
                    <!-- 静态参数表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag v-for="(item,index) in scope.row.attr_vals" :key="index" closable
                                    @close="handleClose(index,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 动态添加tag -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">
                                    + New Tag
                                </el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-adit" size="mini"
                                    @click="showEditDialog(scope.row.attr_id)">编辑
                                </el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini"
                                    @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数对话框 -->
        <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" class="demo-ruleForm">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改参数的对话框 -->
        <el-dialog :title="'修改'+titleText" :visible.sync="EditDialogVisible" width="50%" @close="EditDialogClosed">
            <el-form :model="EditForm" :rules="EditFormRules" ref="EditFormRef" label-width="100px"
                class="demo-ruleForm">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="EditForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="EditDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="EditParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
    export default {
        data() {
            return {
                CateList: [], //获取商品
                cateProps: {
                    value: 'cat_id',
                    label: 'cat_name',
                    children: 'children'
                }, //级联选择框的配置对象
                selectedCateKeys: [], //级联选择框双向数据绑定到的数组
                activeName: 'many', //默认被激活页签名称
                manyTableData: [], //动态参数数据
                onlyTableData: [], //静态属性数据
                addDialogVisible: false, //控制对话框显示隐藏
                addForm: {}, //添加表单数据对象
                addFormRules: {
                    attr_name: [
                        { required: true, message: '请输入参数名称', trigger: 'blur' }
                    ]
                }, //添加表单验证规则对象
                EditDialogVisible: false,//控制对话框显示隐藏
                EditForm: {}, //修改表单数据对象
                EditFormRules: {
                    attr_name: [
                        { required: true, message: '请输入参数名称', trigger: 'blur' }
                    ]
                },//修改表单验证规则对象
                inputVisible: false, //控制tag=>News按钮与文本框切换显示
                inputValue: '' //tag=>News文本框输入内容
            }
        },
        created() {
            this.getCateList();
        },
        methods: {
            //获取所有商品分类列表
            async getCateList() {
                const { data: res } = await this.$http.get('categories');
                if (res.meta.status == 200) {
                    this.CateList = res.data;
                } else {
                    this.$message.error('获取商品分类失败');
                }
            },
            //级联选择框选择项变化触发
            handleChange() {
                this.getParamsDate();
            },
            //tabs页签点击事件处理函数
            handleTabClick() {
                this.getParamsDate();
            },
            // 获取参数的列表数据
            async getParamsDate() {
                if (this.selectedCateKeys.length != 3) {
                    this.selectedCateKeys = [];
                    this.manyTableData = [];
                    this.onlyTableData = [];
                } else {
                    //根据所选分类id和当前所处面板获取对应的参数
                    const { data: res } = await this.$http.get
                        (`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } });
                    if (res.meta.status == 200) {
                        res.data.forEach(item => {
                            item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : [];
                            // 添加布尔值控制每个item文本框显示隐藏
                            item.inputVisible = false
                            item.inputValue = ''
                        })
                        if (this.activeName == 'many') {
                            this.manyTableData = res.data;
                        } else {
                            this.onlyTableData = res.data;
                        }
                    } else {
                        this.$message.error('获取参数失败');
                    }
                }
            },
            //监听对话框关闭事件
            addDialogClosed() {
                this.$refs.addFormRef.resetFields();
            },
            //点击按钮添加参数
            addParams() {
                this.$refs.addFormRef.validate(async valid => {
                    if (!valid) {
                        return
                    } else {
                        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
                            attr_name: this.addForm.attr_name,
                            attr_sel: this.activeName
                        })
                        if (res.meta.status == 201) {
                            this.addDialogVisible = false;
                            this.getParamsDate();
                            this.$message.success('添加成功');
                        } else {
                            this.$message.error('添加失败');
                        }
                    }
                })
            },
            //修改Dialog对话框状态
            async showEditDialog(attr_id) {
                // 查询当前参数信息
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
                    {
                        params: { attr_sel: this.activeName }
                    });
                if (res.meta.status == 200) {
                    this.EditForm = res.data;
                } else {
                    this.$message.error('获取信息失败');
                }
                this.EditDialogVisible = true;
            },
            //重置表单数据项
            EditDialogClosed() {
                this.$refs.EditFormRef.resetFields();
            },
            //点击按钮提交修改参数信息
            EditParams() {
                this.$refs.EditFormRef.validate(async valid => {
                    if (!valid) {
                        return
                    } else {
                        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.EditForm.attr_id}`, {
                            attr_name: this.EditForm.attr_name,
                            attr_sel: this.activeName
                        })
                        if (res.meta.status == 200) {
                            this.getParamsDate();
                            this.EditDialogVisible = false;
                            this.$message.success('修改参数成功');
                        } else {
                            this.$message.error('修改参数失败')
                        }
                    }
                })
            },
            // 根据id删除对应的选择项
            async removeParams(attr_id) {
                const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).catch(error => error)
                //删除
                if (confirmResult !== 'confirm') {
                    this.$message.info('已取消删除');
                } else {
                    const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`);
                    if (res.meta.status == 200) {
                        this.getParamsDate();
                        this.$message.success('删除成功');
                    } else {
                        this.$message.error('删除失败');
                    }
                }
            },
            //对attrvals的操作报存到数据库handleInputConfirm调用
            async saveAttrVals(row) {
                const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                    attr_name: row.attr_name,
                    attr_sel: row.attr_sel,
                    attr_vals: row.attr_vals.join(',')
                })
                //
                if (res.meta.status == 200) {
                    this.$message.success('修改参数项成功!');
                } else {
                    this.$message.error('修改参数项失败!');
                }
            },
            // 文本框失去焦点或Enter键触发
            async handleInputConfirm(row) {
                if (row.inputValue.trim().length == 0) {
                    row.inputValue = '';
                    row.inputVisible = false;
                    return;
                } else {
                    row.attr_vals.push(row.inputValue.trim())
                    row.inputValue = '';
                    row.inputVisible = false;
                    this.saveAttrVals(row);
                }
            },
            // 点击按钮,展示News文本输入框
            showInput(row) {
                row.inputVisible = true;
                //$nextTick当页面元素被重新渲染之后才会指定回调函数中的代码
                this.$nextTick(_ => {
                    this.$refs.saveTagInput.$refs.input.focus();
                });
            },
            // 删除对应参数可选性
            handleClose(index, row) {
                row.attr_vals.splice(index, 1);
                this.saveAttrVals(row);
            },
        },
        computed: {
            // 如果按钮需要被禁用择返回true
            isBtnDisabled() {
                if (this.selectedCateKeys.length != 3) {
                    return true
                } else {
                    return false
                }
            },
            // 当前选中三级分类的id
            cateId() {
                if (this.selectedCateKeys.length == 3) {
                    return this.selectedCateKeys[2];
                } else {
                    return null;
                }
            },
            // 动态计算标题文本
            titleText() {
                if (this.activeName == 'many') {
                    return '动态参数'
                } else {
                    return '静态属性'
                }
            },

        },
    }
</script>

<style lang="scss" scoped>
    .cat_opt {
        margin: 15px 0;

        span {
            margin: 0 10px 0 0;
        }
    }
</style>